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API | 操作名 | 操作描述 |
下载对象 | 下载一个对象至本地 |
cos_status_t *cos_resumable_download_file(cos_request_options_t *options,cos_string_t *bucket,cos_string_t *object,cos_string_t *filepath,cos_table_t *headers,cos_table_t *params,cos_resumable_clt_params_t *clt_params,cos_progress_callback progress_callback);
参数名称 | 参数描述 | 类型 |
options | COS 请求选项 | Struct |
bucket | 存储桶名称，存储桶的命名格式为 BucketName-APPID，此处填写的存储桶名称必须为此格式 | String |
object | Object 名称 | String |
filepath | Object 本地文件名称 | String |
headers | COS 请求附加头域 | Struct |
params | COS 请求操作参数 | Struct |
clt_params | 下载对象控制参数 | Struct |
part_size | 块大小，单位为 bytes，如果用户指定的 part_size 小于4194304（4MB），则按4194304（4MB）处理 | Int |
thread_num | 线程池大小，默认为1 | Int |
enable_checkpoint | 是否使能断点续传 | Int |
checkpoint_path | 当使能断点续传时，表示保存上传进度的文件路径，默认路径为 <filepath>.cp，其中 filepath 为 Object 本地文件名称 | String |
progress_callback | 下载进度回调函数 | Function |
返回结果 | 描述 | 类型 |
code | 错误码 | Int |
error_code | 错误码内容 | String |
error_msg | 错误码描述 | String |
req_id | 请求消息 ID | String |
#include "cos_http_io.h"#include "cos_api.h"#include "cos_log.h"// endpoint 是 COS 访问域名信息，详情请参见 https://www.tencentcloud.com/document/product/436/6224 文档static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";// 开发者拥有的项目身份ID/密钥，可在 https://console.tencentcloud.com/cam/capi 页面获取static char *TEST_ACCESS_KEY_ID; //your secret_idstatic char *TEST_ACCESS_KEY_SECRET; //your secret_key// 开发者访问 COS 服务时拥有的用户维度唯一资源标识，用以标识资源，可在 https://console.tencentcloud.com/cam/capi 页面获取static char TEST_APPID[] = "<APPID>"; //your appid//the cos bucket name, syntax: [bucket]-[appid], for example: mybucket-1253666666，可在 https://console.tencentcloud.com/cos5/bucket 查看static char TEST_BUCKET_NAME[] = "<bucketname-appid>";static char TEST_DOWNLOAD_NAME4[] = "multipart_download.dat";static char TEST_MULTIPART_OBJECT4[] = "multipart4.dat";void log_status(cos_status_t *s){cos_warn_log("status->code: %d", s->code);if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);}void init_test_config(cos_config_t *config, int is_cname){cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);cos_str_set(&config->appid, TEST_APPID);config->is_cname = is_cname;}void init_test_request_options(cos_request_options_t *options, int is_cname){options->config = cos_config_create(options->pool);init_test_config(options->config, is_cname);options->ctl = cos_http_controller_create(options->pool, 0);}void test_resumable(){cos_pool_t *p = NULL;int is_cname = 0;cos_status_t *s = NULL;cos_request_options_t *options = NULL;cos_string_t bucket;cos_string_t object;cos_string_t filepath;cos_resumable_clt_params_t *clt_params;cos_pool_create(&p, NULL);options = cos_request_options_create(p);init_test_request_options(options, is_cname);cos_str_set(&bucket, TEST_BUCKET_NAME);cos_str_set(&object, TEST_MULTIPART_OBJECT4);cos_str_set(&filepath, TEST_DOWNLOAD_NAME4);clt_params = cos_create_resumable_clt_params_content(p, 5*1024*1024, 3, COS_FALSE, NULL);s = cos_resumable_download_file(options, &bucket, &object, &filepath, NULL, NULL, clt_params, NULL);log_status(s);cos_pool_destroy(p);}int main(int argc, char *argv[]){// 通过环境变量获取 SECRETID 和 SECRETKEYTEST_ACCESS_KEY_ID = getenv("COS_SECRETID");TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");if (cos_http_io_initialize(NULL, 0) != COSE_OK) {exit(1);}//set log level, default COS_LOG_WARNcos_log_set_level(COS_LOG_WARN);//set log output, default stderrcos_log_set_output(NULL);test_resumable();cos_http_io_deinitialize();return 0;}
#include "cos_http_io.h"#include "cos_api.h"#include "cos_log.h"// endpoint 是 COS 访问域名信息，详情请参见 https://www.tencentcloud.com/document/product/436/6224 文档static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";// 开发者拥有的项目身份ID/密钥，可在 https://console.tencentcloud.com/cam/capi 页面获取static char *TEST_ACCESS_KEY_ID; //your secret_idstatic char *TEST_ACCESS_KEY_SECRET; //your secret_key// 开发者访问 COS 服务时拥有的用户维度唯一资源标识，用以标识资源，可在 https://console.tencentcloud.com/cam/capi 页面获取static char TEST_APPID[] = "<APPID>"; //your appid//the cos bucket name, syntax: [bucket]-[appid], for example: mybucket-1253666666，可在 https://console.tencentcloud.com/cos5/bucket 查看static char TEST_BUCKET_NAME[] = "<bucketname-appid>";void log_status(cos_status_t *s){cos_warn_log("status->code: %d", s->code);if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);}void init_test_config(cos_config_t *config, int is_cname){cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);cos_str_set(&config->appid, TEST_APPID);config->is_cname = is_cname;}void init_test_request_options(cos_request_options_t *options, int is_cname){options->config = cos_config_create(options->pool);init_test_config(options->config, is_cname);options->ctl = cos_http_controller_create(options->pool, 0);}void test_download_directory(){cos_pool_t *p = NULL;int is_cname = 0;cos_status_t *s = NULL;cos_request_options_t *options = NULL;cos_string_t bucket;cos_string_t file_name;cos_string_t suffix = cos_string("/");cos_table_t *resp_headers;cos_table_t *headers = NULL;cos_table_t *params = NULL;int is_truncated = 1;cos_string_t marker;apr_status_t status;//初始化请求选项cos_pool_create(&p, NULL);options = cos_request_options_create(p);init_test_request_options(options, is_cname);cos_str_set(&bucket, TEST_BUCKET_NAME);//list object (get bucket)cos_list_object_params_t *list_params = NULL;list_params = cos_create_list_object_params(p);cos_str_set(&list_params->prefix, "folder/"); //替换为您自己的目录名称cos_str_set(&marker, "");while (is_truncated) {list_params->marker = marker;s = cos_list_object(options, &bucket, list_params, &resp_headers);log_status(s);if (!cos_status_is_ok(s)) {printf("list object failed, req_id:%s\\n", s->req_id);break;}cos_list_object_content_t *content = NULL;cos_list_for_each_entry(cos_list_object_content_t, content, &list_params->object_list, node) {cos_str_set(&file_name, content->key.data);if (cos_ends_with(&content->key, &suffix)) {//如果是目录需要先创建, 0x0755权限可以自己按需修改，参考apr_file_info.h中定义status = apr_dir_make(content->key.data, 0x0755, options->pool);if (status != APR_SUCCESS && !APR_STATUS_IS_EEXIST(status)) {printf("mkdir: %s failed, status: %d\\n", content->key.data, status);}} else {//下载对象到本地目录，这里默认下载在程序运行的当前目录s = cos_get_object_to_file(options, &bucket, &content->key, headers, params, &file_name, &resp_headers);if (!cos_status_is_ok(s)) {printf("get object[%s] failed, req_id:%s\\n", content->key.data, s->req_id);}}}is_truncated = list_params->truncated;marker = list_params->next_marker;}//销毁内存池cos_pool_destroy(p);}int main(int argc, char *argv[]){// 通过环境变量获取 SECRETID 和 SECRETKEYTEST_ACCESS_KEY_ID = getenv("COS_SECRETID");TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");if (cos_http_io_initialize(NULL, 0) != COSE_OK) {exit(1);}//set log level, default COS_LOG_WARNcos_log_set_level(COS_LOG_WARN);//set log output, default stderrcos_log_set_output(NULL);test_download_directory();cos_http_io_deinitialize();return 0;}
cos_status_t *cos_get_object_to_file(const cos_request_options_t *options,const cos_string_t *bucket,const cos_string_t *object,cos_table_t *headers,cos_table_t *params,cos_string_t *filename,cos_table_t **resp_headers);
参数名称 | 参数描述 | 类型 |
options | COS 请求选项 | Struct |
bucket | 存储桶名称，存储桶的命名格式为 BucketName-APPID，此处填写的存储桶名称必须为此格式 | String |
object | Object 名称 | String |
headers | COS 请求附加头域 | Struct |
params | COS 请求操作参数 | Struct |
filename | Object 本地保存文件名称 | String |
resp_headers | 返回 HTTP 响应消息的头域 | Struct |
返回结果 | 描述 | 类型 |
code | 错误码 | Int |
error_code | 错误码内容 | String |
error_msg | 错误码描述 | String |
req_id | 请求消息 ID | String |
#include "cos_http_io.h"#include "cos_api.h"#include "cos_log.h"// endpoint 是 COS 访问域名信息，详情请参见 https://www.tencentcloud.com/document/product/436/6224 文档static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";// 开发者拥有的项目身份ID/密钥，可在 https://console.tencentcloud.com/cam/capi 页面获取static char *TEST_ACCESS_KEY_ID; //your secret_idstatic char *TEST_ACCESS_KEY_SECRET; //your secret_key// 开发者访问 COS 服务时拥有的用户维度唯一资源标识，用以标识资源，可在 https://console.tencentcloud.com/cam/capi 页面获取static char TEST_APPID[] = "<APPID>"; //your appid//the cos bucket name, syntax: [bucket]-[appid], for example: mybucket-1253666666，可在 https://console.tencentcloud.com/cos5/bucket 查看static char TEST_BUCKET_NAME[] = "<bucketname-appid>";// 对象键，对象（Object）在存储桶（Bucket）中的唯一标识。有关对象与对象键的进一步说明，请参见 https://www.tencentcloud.com/document/product/436/13324 文档static char TEST_OBJECT_NAME1[] = "1.txt";static char TEST_DOWNLOAD_NAME[] = "download_test3.dat";void log_status(cos_status_t *s){cos_warn_log("status->code: %d", s->code);if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);}void init_test_config(cos_config_t *config, int is_cname){cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);cos_str_set(&config->appid, TEST_APPID);config->is_cname = is_cname;}void init_test_request_options(cos_request_options_t *options, int is_cname){options->config = cos_config_create(options->pool);init_test_config(options->config, is_cname);options->ctl = cos_http_controller_create(options->pool, 0);}void test_download_object(){cos_pool_t *p = NULL;int is_cname = 0;cos_status_t *s = NULL;cos_request_options_t *options = NULL;cos_string_t bucket;cos_string_t object;cos_string_t file;cos_table_t *resp_headers = NULL;//创建内存池cos_pool_create(&p, NULL);//初始化请求选项options = cos_request_options_create(p);init_test_request_options(options, is_cname);cos_str_set(&bucket, TEST_BUCKET_NAME);//获取对象cos_str_set(&file, TEST_DOWNLOAD_NAME);cos_str_set(&object, TEST_OBJECT_NAME1);s = cos_get_object_to_file(options, &bucket, &object, NULL, NULL, &file, &resp_headers);if (cos_status_is_ok(s)) {printf("get object succeeded\\n");} else {printf("get object failed\\n");}//销毁内存池cos_pool_destroy(p);}int main(int argc, char *argv[]){// 通过环境变量获取 SECRETID 和 SECRETKEYTEST_ACCESS_KEY_ID = getenv("COS_SECRETID");TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");if (cos_http_io_initialize(NULL, 0) != COSE_OK) {exit(1);}//set log level, default COS_LOG_WARNcos_log_set_level(COS_LOG_WARN);//set log output, default stderrcos_log_set_output(NULL);test_download_object();cos_http_io_deinitialize();return 0;}
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